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ISRN Materials Science
Volume 2013 (2013), Article ID 649043, 8 pages
Research Article

Experimental Investigations on the Induced Anisotropy of Mechanical Properties in Polycarbonate Films

1Department of Polymer Engineering Paderborn (KTP), University of Paderborn, 33098 Paderborn, Germany
2Laboratory for Technical Mechanics (LTM), University of Paderborn, 33098 Paderborn, Germany

Received 22 January 2013; Accepted 13 February 2013

Academic Editors: K. Hokamoto, Y. Kusano, Y. Masuda, and S. Matsuya

Copyright © 2013 Andrea Wibbeke et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The prime aim of this paper is to investigate, with the help of experiments, the induced anisotropy of mechanical properties in polycarbonate films. It is known that a molecular orientation in polymer materials occurs through cold-forming. In this study, cold forming is performed at room temperature on a tensile testing machine. The polycarbonate films are examined in two phases. In the first phase, the specimen is loaded, while the prestrain is varied, and in the second, it is loaded, while the material direction is varied. The main findings are that the prestrain has virtually no influence on the anisotropy and that the material direction does exert a major influence. Furthermore, this paper summarizes comparisons of anisotropic characteristic data, maximum stresses, elasticity moduli and failure strain.